1. To make brownies, sift flour, baking powder and cocoa powder together into a bowl. Add sugar, yogurt, eggs, vanilla essence and oil and mix to combine.
2. Pour batter into a 20 cm / 8 in square cake tin lined with nonstick baking paper and bake at 180°C/350°F/Gas 4 for 25-30 minutes or until brownies are firm.
3. Allow brownies to cool in tin. Cut into squares and serve with fresh fruit and vanilla yogurt.